ElementUI表单校验：如何循环生成的Form表单添加校验

ElementUI表单校验：如何循环生成的Form表单添加校验。

ElementUI 中使用循环生成的form表单需要动态添加校验的规则

在data中定义好需要的rule,使用Element的语法给 :rules 动态绑定

:prop="getAllTableData.${i}.value"

getAllTableData是v-for绑定的数组，i是索引，value是表单绑定的v-model的名称

HTML代码片段

// An highlighted block
<!-- dialog -->
<el-dialog
    :title="dialogTitle"
    :visible.sync="dialogFormVisible"
    @close="dialogClose"
    :close-on-click-modal="false"
    width="40%"
    class="dialogForm-box"
>
    <el-form
        label-position="left"
        label-width="120px"
        ref="dialogRef"
        :model="getAllFormData"
    >
        <!-- 循环开始  -->
        <template v-for="(item,i) in getAllFormData.getAllTableData">
            <!-- 
            判断循环中的元素是否需要下拉框  
            :rules="item.rule"  循环中的数据 自定义的 rule 规则
            :prop="`getAllTableData.${i}.value`"
            每次循环的时候进行取值, 相当于给每个form绑定了唯一的model
            -->
            <el-form-item
                v-if="item.selectFlag"
                :key="item.labelName"
                :label="item.labelName"
                :prop="`getAllTableData.${i}.value`"
                :rules="item.rule"
                class="selectInput-box"
            >
                <el-select v-model="item.value" placeholder="请选择">
                    <el-option
                        v-for="(item1) in item.selectOption"
                        :key="item1.value"
                        :label="item1.label"
                        :value="item1.value"
                    ></el-option>
                </el-select>
            </el-form-item>
            <el-form-item
                v-else-if="!item.hidden && item.disabled"
                :key="item.labelName"
                :prop="`getAllTableData.${i}.value`"
                :rules="item.rule"
                :label="item.labelName"
            >
                <el-input
                    v-model="item.value"
                    clearable
                    autocomplete="off"
                    :disabled="true"
                ></el-input>
            </el-form-item>
            <el-form-item
                v-else-if="!item.hidden"
                :key="i"
                :prop="`getAllTableData.${i}.value`"
                :rules="item.rule"
                :label="item.labelName"
            >
                <el-input v-model="item.value" clearable autocomplete="off"></el-input>
            </el-form-item>
        </template>
    </el-form>
    <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="FormSureBtn" :loading="SureBtnLoading">确 定</el-button>
    </div>
</el-dialog>

VUE中data中的声明

getAllFormData: {
        getAllTableData: [
             {
                 labelName: "规则ID",
                 value: "",
                 propName: "ruleid",
                 disabled: true,
                 hidden: true,
                 // 规则必须也得定义在form绑定的model中
                 rule: {
                     required: false
                 }
             },
             {
                 labelName: "编码",
                 value: "",
                 propName: "code",
                 rule: {
                     // ElementUI 表单校验规则的语法
                     validator: (rule, value, callback) => {
                         if (value == "") {
                             callback();
                         } else {
                             // 采用正则表达式进行判断
                             let reg = /[\u4E00-\u9FA5\uF900-\uFA2D]/;
                             if (reg.test(value)) {
                                 callback(new Error("请输入英文或数字"));
                             } else {
                                 callback();
                             }
                         }
                     },
                     trigger: "blur"
                 }
             },
             {
                 labelName: "名称",
                 value: "",
                 propName: "name",
                 rule: {}
             },
             {
                 labelName: "审核类别",
                 value: "",
                 propName: "typename",
                 rule: {}
             },
             {
                 labelName: "字段名称",
                 value: "",
                 propName: "fieldcode",
                 rule: {}
             },
             {
                 labelName: "备注",
                 value: "",
                 propName: "memo",
                 rule: {}
             },
        
             {
                 labelName: "评分",
                 value: "",
                 propName: "mark",
                 prop: "mark",
                 rule: {
                     required: true,
                     validator: (rule, value, callback) => {
                         if (value == "") {
                             callback(new Error("请输入数字"));
                         } else {
                             let reg = /^[0-9]+([.]{1}[0-9]{1})?$/;
                             if (!reg.test(value) || value > 100) {
                                 callback(new Error("请输入0-100的有效数字,可保留一位小数"));
                             } else {
                                 callback();
                             }
                         }
                     },
                     trigger: "blur"
                 }
             },
             {
                 labelName: "警告标识",
                 value: "",
                 propName: "warnsign",
                 prop: "warnsign",
                 selectFlag: true,
                 selectOption: [
                     {
                         value: "0",
                         label: "否"
                     },
                     {
                         value: "1",
                         label: "是"
                     }
                 ],
                 rule: {
                     required: true,
                     message: "请选择对应的选项"
                 }
             }
             ]
 },

看看效果：

required: true,说明该内容是必须填写的，否则会提示错误文字。

正则表达式可以自定义项目需求的样式：

<el-form :model="upsertForm" ref="upsertForm" label-width="100px" class="demo-dynamic">
  <el-form-item
    prop="email"
    label="邮箱"
    :rules="[
      { required: true, message: '请输入邮箱地址', trigger: 'blur' },
      { type: 'email', message: '请输入正确的邮箱地址', trigger: ['blur', 'change'] }
    ]"
  >
    <el-input v-model="upsertForm.email"></el-input>
  </el-form-item>
  <el-form-item
    v-for="(domain, index) in upsertForm.domains"
    :label="'专利号' + index"
    :key="domain.key"
    :prop="'domains.' + index + '.value'"
    :rules="{
      required: true, message: '专利号不能为空', trigger: 'blur'
    }"
  >
    <el-input v-model="domain.value"></el-input><el-button @click.prevent="removeDomain(domain)">删除</el-button>
  </el-form-item>
  <el-form-item>
    <el-button type="primary" @click="submitForm('upsertForm')">提交</el-button>
    <el-button @click="addDomain">新增专利号</el-button>
    <el-button @click="resetForm('upsertForm')">重置</el-button>
  </el-form-item>
</el-form>
<script>
  export default {
    data() {
      return {
        upsertForm: {
          domains: [{
            value: ''
          }],
          email: ''
        }
      };
    },
    methods: {
      submitForm(formName) {
        this.$refs[formName].validate((valid) => {
          if (valid) {
            alert('submit!');
          } else {
            console.log('error submit!!');
            return false;
          }
        });
      },
      resetForm(formName) {
        this.$refs[formName].resetFields();
      },
      removeDomain(item) {
        var index = this.upsertForm.domains.indexOf(item)
        if (index !== -1) {
          this.upsertForm.domains.splice(index, 1)
        }
      },
      addDomain() {
        this.upsertForm.domains.push({
          value: '',
          key: Date.now()
        });
      }
    }
  }
</script>

注意：

循环的是文本框，它隶属于form 表单，form 表单绑定的是upsertForm ，所以，它的对象必须要在upsertForm 里面，才能生效。

大家试试吧！